Please be sure you are looking for the product that has the most scientifically proven results. You can't buy it all. This is my first review on this website and I have a lot to learn, so I welcome your comments and suggestions. I am always happy to answer questions. Here is a summary of what to look for in a product to tighten your skin: 1. What is the active ingredient? For most products, it is a combination of a chemical (eg glycolic acid, vitamin C, or sodium ascorbate) and a chemical (eg zinc oxide, ceramides, or lactic acid) and usually also a protein or amino acid. In general, the more powerful the active ingredient, the better the tightening effect (but not always, see the next point below). 2. What are the side effects? Side effects can include dryness, irritation, and inflammation. 3. How long is the product used? The duration of a product's use depends on the product and your skin condition. Some of them are mild. Others are serious. If your skin is a little rough and you use this product, you'll need to use a moisturizer to smooth the skin back to normal. 4. Do you use a lot or not? You should use a lot of products.